Reverse-current responsive device



G. A. BURNHAM REVERSE CURENT RESFONS i VF DEV l CE 2 SHEET A sHET l F1LED MAR venawm ENA@ W RESPONSIVE DEV i CE FzLaD MAR E CURR Patientcc Feb5, qj

" U N I T E. I)

GEORGE A. BURNHAM7 I L Be it known that (11mm a citizen nf ma UniiidSaugzus, in h@ county of Massilchnse .nnvc imw ment in Reve vives. ofwhich iii? "ntion.

My inren'ion rean),

vices .ndaped 'in man@ rent How l{hervin reni How exceeds Revers/ecin-rei' 15 verse cnrrcn' r strnoted haring :i i" thv current finw iithe potential of sai( sultingr from Said poire is coxnniony arrzn'igfedo npqn rvvcrse current Coresuitnnt fin); acts upon n armature which is:litri fied trolled by im (bylaw) Such a darme? Wh also opeinie tovenise L Circuit npnn n Htrzgfi i ciently high Vuiw. fncii verse(furrnni' derive if; sirable feature. fiirhernmri.

of they derive ',lepcniis 'm :e 'liv the 'aine nip' iii, wnnin.potentiaL-tiie i 512M, the reverse/d Curran of the deice m ii 40 whichthe reversa@ i Thisalsoisnnnnilf. i Q `feiri fn as there are' cnnditinnni potential across the poen'izzby cause the device. to he ino?iresponsive to any reversed that of mi exrnely high v:

An objectl 0i: my inve? vision @flu devire which wm terrup :i circuitupon ai rovi HOW therein .und which sponsive to d reversal ni and willbe inop'zitive lll ing position across both bars and. 14:. divides tbcrectangular magnetic circuit into tivo luilves one oit which includesthe flux from tliel potentiel or shunt coil und the other ot whichincludes the dux from the current or 'series coil.

Seid armature 19 is provided Withe knob V2l et the end of seid link withthe latch 25 li if ot s. current breslrer or' otbercircuit controllingldevice having' u movable or' bruslo member elle armature 19 ismaintained by the energisstion seid potentiel or shuntsnd current oreries coils adjacent said cross bars und -Upon s 'reversal of currentflow,

Aseid armature is released vund ycaused-posi ,ly to be moved upwardthereby to cause' the tripping or' seid latch 25 andthe openv `1') Ybreaker 'and the interruption ot controlled thereby.

24. at the end of seid'lever 21 forros ineens whereby the armature 1t ofthe rev e curr-ent device may be reset Without' into such u posntionvseid; 'letclii t tue bi cannot be closed :titel oeing opened by' tliedevice.

@sul stri?) l? is rovi'ded with reflexed portions L82* vcrteumd belowsind crossbur 3.5 and n t'orlred lever having erms 27 and' 27a ispivoted thereto. Said forked lever provides ineens whereby the reversecurrent device upon di flow.

A block list/'ing e centrel opening `therein is pivoted ut 29rbetweenthe arms of'seid forked lever. rod 30 .lies one end slidsbly y beconditioned for* operation Aingr velues oi' reversed current errsnged inthe centrelopening ol seid' bloot: 28 und its other end 1s disposed in erecess 31 in the' under side of seid srins tur lll sind is forcibly heldin said recess by s spring 32 willich engages seid block 2d end :icoller Sil to seid rod 30. By suoli en urrnngeinent seid armature 19Aisnornlsll pressed upward toward un operated position, beingrestreinedfrom upward Inovenients however, by the normal energizetion otthe current und potential coils.

By the provision' of the sliding andpivotsl connection between seid rod30 und the forked. lever, suoli un upward movement of the armature 19 ispermitted Witliout'cuus l ing tbe disenpjspjfenientl of said rod fromseid :lf'orlred lever end armature.

to increase or decrease the nl" ioping spring to move upward upon.

` ln sn inoperative position of the device',y

is provided With en arcuate portion 36 corresponding to the path ofmovement of the end of seid lever 27 and is positioned sdmiiy beprovided With aseries ot' calibrations rit-Which the forkedlever may beset for various conditions otoperstion'. A slot 3l isormed inssid srcuteportionBG 'and -ebutton 39 is screw threaded on seid bolt 38 and formsineens whereby said lever may be secured in any adjusted position to thearcunte'portion of said strip 35. Suid but# ton, for tbe purpose ofmoving seid leverv from one position to another posltlon, will..

jacent the end of seid lever.- lts outer fece be slightly unscrewed,thereby to free` seid-L leverl from seid strip 35 and etterwerdv otightened to clump seid lever to seid strip.A

'A pointer 40 is arranged on said b olt 39 and is adapted to registerwith e calibration on Y seid strip 35 to indicate. the device. y

When the reverse' current device above de scribed is in use to protecta. circuit against' reversal of current flow therein, the poten setting"of the tiel coil is connected across or in shunt with .the circuit tobe protected, and ,the current or series coil ll is connected in serieswith l the circuit to be protected. The connections ot the coils withtliecircuit are so -arranged'y that when current direction 1n thecircuit, the flux 'in tbe rectanguler magnetic circuit dus vtothe'poteni tiel coil is vnormally buclringtlie flux in said V, magneticcircuit due to the series coil. pp

posits;y consequent poles srethereby set up in the two cross. bars' 14und. 15 edjecent the` ends of the armature 19 and seid armstnref 1:nosiis 'pulled down to its. normal'attractc l t1on, or it maybemanually movedinto'sucb is flowing' inthe' proper position7 where itwill `be heldv by 'the flux' f of both the potentiel and series coilsagainst the action of the spring 32. Said potentiel und series coilstherefore normally ect.

in conjunction, or assist each other, through the armature 19, Wlulenormally bucking each other through therectsngular magnetic circuit.vlVhen' the current inthe circuit includ-ingg the series coil .411becomes. relatively reversed, the instantaneous polarity of said coilbecomes reversed with respect to the instantaneous polarity of the'potential coil and consequently tbe l consequent 'poles noru mollysetup in'tbecross bers ,14 and ldsappear andthetlumdue to-'the tivocoilsassists' each other in rectum is-r lnurnnetic circuit andconsequently,'asthere is no flux? or at the most, unsulcient llurytobold the l armature 19in ettrscted position, the 'spring i'scts to torcethe armature lt* upward' into retrsetel position. As seid orineturemoves upwsrd, tlie linlr 2l. connected therewith is v`.

magnetic circuit, said coils arranged noi-'.1

sition upon a. relative reversal of current inally'to hold said armaturein attracted podiei/v in said, coils,

sitioii and upon relatively reversed current conditions to releasesaidarniature to permit vit forcibly to move to4 an operated position'5.6. A reverse` series device comprising avcurrent coil,"a potentialcoil, a common magnetic circuit therefor, and an armature asso cia-tedwith said magnetic circuit, said coils arranged norinallyto hold saidarmature in attracted p.c"ition and lupon relatively reversed currentconditionstherein to weakentheir attractive eiiect upon the armature topermit said armature to move away from attracted position. l

7. A reverse current protective -device comprisi'iig a rectangularstructure. ada ted to provide 'a magneticcircuit, series van potentialcoils disposed on opposite legs of said structure, the leg associatedwith said series coil arrangedto become saturated for values of current'flow in said coil above a predetermined value, while the remainderv ofthe magnetic circuit is below saturation,

I whereby to restrict'thceilec't of said series coil, and an armatureassociated' withsaid magnetic circuit arranged to be operably `aii'ectedby'relatively'reversed current conf ,ditions in said coils o 8. Areverse 'current protective device for electriccircuits comprising aseries coil, af

potential coil, a common magnetic.' circuit for' said coils, an armatureassociated with said magnetic circuit, said `coils arranged toact inopposition through said magnetic circuit and in conjunction through andattract said.

armature upon vnormal current conditions in said coils and to act ,inyconjunction ,i through said 'magnetic circuit and release lsaid,armature upon va relative reversal'o'f Icurrent flow in said coils, andmeans forcibly to move-said armature to retractedposition upon suchreversal ci current lowinsaid i coils,'and means to move said armatureinto 9. reverse 4current responsive l-levice"A comprising' aseries coil,a potential coil, a- 4common magnetic circuit for'said coils, saidpotential current coils Iarranged to normally act iu opi'iositloiivthrough said iii-aignetic circuit, an armature'movable to a bridgingposition vacross said magnetic circuit between said coils and normallyheld in such position by the vrhin in said. circuit,` and 'to move saidarmature to a remote poreverse current responsive device having a seriescoil, apoteiitial coil, a coin- -1().\A reverse current responsivedevice Ycomprising a series co-il, a potential coil, a

common 'magnetic circuit therefor having" 'means to restrict the effectosaid series coil on said circuit, said coils arranged to act inopposition' through said magnetic circuit under normal` current`'conditions therein, a armature' associated with said'magnetic c -cuit'and arranged to bridge saidmagnetic circuit between said coils and `tohe normallyv attractedto and held in bridging position by 'the flux insaid inaggfneticI circuituiider nor-` vmal conditions or'- circuit lowin said coils and to move into retracted position upon la relativereversal of current flow in said coils.

' 11'. A reverse current" responsive device comprisinga series coil, apotential coil, a

v'common magnetic circuit Vthereforl having ,means to restrict theeil'ect of said series coil o n said circuit, said coils arranged to actin opposition through said magnetic' 'circuitfunfj der normal currentconditions therein, an.-

armature associated withsaid magnetic cir- 1 cuit and arranged to bridgesaid magnetic circ-uit between said coils, and to'be attractl` ed to andheld in bridging position by the flux in said magnetic circuit undernormal conditions oic current low in said coils, and a spring positivelyto'inove saidarmature into retracted position upon a relative reverIsall of current lovv in said coils.

" 12. A reverse current responsive device". i comprising a series coil,a potential co11,:.a

common ma rnetic circuit therefor anais mature associated with saidmagnetic circuit arrangedto provide an in ependent inag- -neti'c circuittor each coil and beheld in attriicted position uponnoi'inal conditionsor' current ilow in's'aid coils, said magnetic circuit'liaving means torestrict the effector said series 'c oiion saidarmature upon a currentlow in said coil in excess or a predetermined magnitude, and means toinovesaid` armature'"tofa' retracted position u onl a' relativereversalof current low in sai coils.A 13. A reverse v'current responsivel devicecomprising aseriescoil, va, potential coil, a. magnetic circuit for saidcoils, an armature 4included iii'l said magnetic circuit, arranged icelitf

normally to be h eldv in attracted position upon normal current flowwnditioneinjeaid a retracted lposition upon a-rclative 'reversal ofcurrentflow iii said coils, said meaiisactthe reversed curren't'low; 14,A lreverse current responsive device comprising ,a 'rectangularstructure adapted" f ies". ing with a forceindependent of the value of Asind armadura im z, rera; 'Qd

ns. verse curro" responsive dexgg :i 155mm' structure 'avide amargini-@tic Giraldi, series i. rods irrrzzngfmi on opppsle kgs mi Saidsi; Heime, i111@ ieu' rd' said strucurfe mx-Jmnled *di sam ,QL 1L @mihaving Ensur- 1 mts-rial und adapted to bf come sutu'zited for mhws ofciu-wm Ihm' in said coi above u prvdvtermimul mngnr ude,J a.` pivoedarmature :irrnngvd 'Lo 1w moved tu and im held in am attracted position:1C-ross Suid sriwture between said coils 11pm] norma] conditions ofciu-ront How in said coils, u sprin' t@ force said :rmuturv into aretracted pC-@itimi upon a` relative rrvrrszd 0i' Current- 'fow in saidcoils, and 11103115 w :1djus'f *he tension of said Spring.

n testimony whereof, have signed my neun@ to vthis; speciczztion, inthe, presence of -iwo subscribing Witnesses.

GEQRGE A. VBURNI'LUI. 'Wixesses z T; T. (hmmm/00D,

B. DAVIS.

